# JEP 483: Ahead-of-Time Class Loading and Linking in Java 24

DevFeed: [JEP 483: Ahead-of-Time Class Loading and Linking in Java 24](<https://devfeed.tech/articles/let-s-take-a-look-at-jep-483-ahead-of-time-class-loading-linking-18841.md>)

Original publisher: [Read original article](<https://www.morling.dev/blog/jep-483-aot-class-loading-linking/>)

Published: 2025-03-27T13:00:00Z

Content type: article

Language: en

Sources: [Gunnar Morling](<https://devfeed.tech/sources/gunnar-morling.md>)

Topics: [Java](<https://devfeed.tech/topics/java.md>), [openjdk](<https://devfeed.tech/topics/openjdk.md>), [Kafka](<https://devfeed.tech/topics/kafka.md>), [apache-flink](<https://devfeed.tech/topics/apache-flink.md>)

Tags: [building](<https://devfeed.tech/tags/building.md>), [java](<https://devfeed.tech/tags/java.md>), [jvm](<https://devfeed.tech/tags/jvm.md>), [openjdk](<https://devfeed.tech/tags/openjdk.md>), [performance](<https://devfeed.tech/tags/performance.md>)

## AI overview

This article examines JEP 483, which loads and links Java classes ahead of time and caches the results to reduce application startup time. It explains the feature's role in Project Leyden, its relationship to AppCDS, the training-run and classpath requirements, and examples using Apache Kafka and Apache Flink.

## Source excerpt

Table of Contents Building an AOT Cache for Apache Kafka AOT Caching With Apache Flink Summary In the "Let's Take a Look at...!" blog series I am exploring interesting projects, developments and technologies in the data and streaming space. This can be KIPs and FLIPs, open-source projects, services, relevant improvements to Java and the JVM, and more. The idea is to get some hands-on experience, learn about potential use cases and applications, and understand the trade-offs involved. If you think there's a specific subject I should take a look at, let me know in the comments below. Java 24 got released last week, and what a meaty release it is: more than twenty Java Enhancement Proposals (JEPs) have been shipped, including highlights such as compact object headers (JEP 450, I hope to spend some time diving into that one some time soon), a new class-file API (JEP 484), and more flexible constructor bodies (JEP 492, third preview). One other JEP which might fly a bit under the radar is JEP 483 ("Ahead-of-Time Class Loading & Linking"). It promises to reduce the start-up time of Java applications without requiring any modifications to the application itself, what's not to be liked about that? Let's take a closer look!